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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebf5edd97e1da84df6bbc65940da9d61410189f7dedc59b6f2a8afa91ff712f' 
  AND token = 'D7sS1PfZytkNUN3Sg6UrMX41u8qoELchCG8VJt58V9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}